?using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            byte [] bb={0x02,0x00,0x00,0x00};
           int ii= BitConverter.ToInt32(bb, 0);
           int intval = 12;

           byte[] arr = BitConverter.GetBytes(intval);

        }
    }
}